I had many expectations when I bought at high prices that lens in 2005. Cleared less than a year later.

Pros:
The zoom range is interesting and allows for shooting wide angle point of view.

Cons:
Too high price for the real qualities. Very bad investment.
No lens hood included. Shame on you Canon!
Compatibility which is limited only to APS-C.
A light cyan color cast typical of EF-S lens.
A lateral chromatic aberration too visible to the shortest focal lengths.
A lack of homogeneity from the center to the edges.

Today, competition is offering better product. If I were you, I will forget that lens.